Singapore

Singapore
Singapore is a city-state in the Asian southwest, funded as a British trading colony in 1819.
Since independence, Singapore is one of the most prosperous countries in the world and has the busiest port in the world.
Singapore is a small country in on a small island with five millions of people.
The city is modern and prosperous with mixtures [you could use a population] of Malaysian, Chinese, and Indian.

Singapore is a gastronomic paradise and has several types of food [you could also use cuisine] as including Chinese, Indian Thailand and Italian.

Singapore

Singapore is a city-state in the South East Asian southwest, founded as a British trading colony in 1819.  Since independence, Singapore is it became/rose to be/ one of the most prosperous countries in the world and has the busiest port in the world.

Singapore It is a small country in a small island with a population of about five millions of people.
City modern and prosperous with There is a mixtures Malaysian, Chinese, and Indian cultures.

Singapore It is also a gastronomic paradise, has where several types of food kinds of cuisines such as Chinese, Indian and Thailand and international ones such as Italian and French.

1.  Singapore is not in South West Asia.

2. Don't use "Singapore". Use "it" instead otherwise you will sound like a repeating parrot.

Singapore 

Singapore is a city-state in the Asian southwest, founded as a British trading colony in 1819. Since its independence, Singapore has been one of the most prosperous countries, and has the busiest port in the world. Singapore is a modern, prosperous, small country in a small island with a population of five million, which includes Malaysian, Chinese and Indian people. Singapore is a gastronomic paradise, which has several types of food, like Chinese, Indian, Thai and Italian. :)